A food desert is a low-income area where a significant number of residents live far from a supermarket or large grocery store. By the most commonly used measure from the USDA, about 18.8 million Americans, or 6.1 percent of the U.S. population, live in these areas. The concept captures a specific problem: when the nearest place to buy fresh fruits, vegetables, and other staples is so far away that getting there becomes a real barrier, especially for people without reliable transportation.
How Food Deserts Are Officially Defined
The USDA identifies food deserts by overlapping two conditions: a neighborhood must be both low-income and low-access. A census tract qualifies as low-income if its poverty rate is 20 percent or higher, or if its median family income falls at or below 80 percent of the statewide or metro-area median. Low-access means that at least 500 people, or 33 percent of the population in that tract, live far from the nearest supermarket, supercenter, or large grocery store.
“Far” depends on where you live. In urban areas, the standard threshold is more than 1 mile from a grocery store. In rural areas, defined as communities with fewer than 2,500 people, it jumps to more than 10 miles. The USDA also tracks alternative distance cutoffs: a tighter half-mile measure for cities and a 20-mile measure for the most remote rural communities. Using the half-mile urban threshold, the number of affected Americans rises sharply to 53.6 million, or 17.4 percent of the population.
Urban and Rural Food Deserts Look Different
In a city, a food desert might mean walking past dozens of fast-food restaurants and corner stores without encountering a single full-service grocery store. The distances are shorter in absolute terms, but without a car, even a mile can be a serious obstacle, particularly for elderly residents, parents with young children, or people with disabilities. Public transit doesn’t always connect residential neighborhoods to grocery stores on practical schedules.
Rural food deserts involve vastly greater distances. A 10-mile trip to the nearest supermarket requires a car, and in some parts of the country that distance stretches to 20 miles or more. When the closest store is a gas station or a small general store, the selection of fresh produce and lean protein shrinks dramatically. Small stores charge an average of 10 percent more than supermarkets for the same items, with some studies finding price gaps of 20 to 30 percent on certain products. For households already stretched thin, that markup adds up fast.
Why Some Neighborhoods Lose Grocery Stores
Food deserts don’t appear randomly. Major grocery chains make location decisions based on profit projections, and low-income neighborhoods are often assessed as not profitable enough to justify a store. Perceived obstacles like higher crime rates, cultural biases, and elevated operating costs push retailers toward suburban locations with larger customer bases and higher spending power. This is market logic working exactly as designed, but it leaves entire communities without essential infrastructure.
The roots often go deeper than present-day economics. Research examining 102 U.S. urban areas has found that neighborhoods redlined in the 1930s are more likely to have unhealthy food environments today, even in census tracts that now have higher incomes and more racial diversity. In that era, the Home Owners’ Loan Corporation created maps that color-coded neighborhoods by perceived lending risk, with “hazardous” areas outlined in red. These were overwhelmingly Black and immigrant communities. The resulting decades of disinvestment drove down property values, shrank the local customer base, and kept food retailers out. Those patterns have proven remarkably persistent across generations.
Health Consequences of Limited Food Access
When the nearest affordable option is a convenience store or fast-food restaurant, diets shift toward processed, calorie-dense foods that are low in nutrients. This pattern contributes to higher rates of obesity, heart disease, and type 2 diabetes. Adults experiencing food insecurity are two to three times more likely to develop type 2 diabetes than those with reliable access to nutritious food.
For people who already have diabetes, living in a food desert makes the condition harder to manage. Limited access to fresh produce and whole grains leads to higher blood sugar levels, more frequent hospitalizations, and greater risk of complications like kidney disease, vision loss, and lower-limb amputations. Skipping meals, a common coping strategy when food is scarce or unaffordable, creates dangerous blood sugar swings. The mental health toll compounds these physical effects: the stress of not knowing where your next meal will come from worsens outcomes across every chronic condition.
Food Swamps: A Related Problem
Some researchers argue that the food desert concept misses half the picture. A “food swamp” describes an area where fast-food outlets, convenience stores, and other sources of cheap, calorie-dense food vastly outnumber healthy options. The problem isn’t just the absence of a supermarket. It’s also the overwhelming presence of unhealthy alternatives. Research suggests food swamps may be an even greater driver of obesity than food deserts alone, because the sheer availability and marketing of processed food shapes daily choices regardless of whether a grocery store exists somewhere in the neighborhood.
Why Some Advocates Prefer “Food Apartheid”
The term “food desert” has drawn criticism for making a political problem sound like a natural one. Deserts are ecosystems shaped by climate and geography. Food deserts are shaped by policy decisions, investment patterns, and racial discrimination. Food justice advocate Karen Washington coined the term “food apartheid” to redirect attention toward the root causes: decades of discriminatory planning, zoning, and lending practices that created and continue to maintain these inequities.
Critics also point out that calling a neighborhood a food desert can unintentionally stigmatize it, framing residents as passive victims rather than acknowledging the community gardens, mutual aid networks, and local food initiatives that already exist in many of these areas. The food apartheid framing emphasizes that healthy, fresh food is readily accessible in wealthy neighborhoods while unhealthy food dominates poor ones, and that this disparity results from intentional choices embedded in political and economic systems.
What’s Been Done to Improve Access
Interventions that work tend to combine several strategies at once. The most effective programs increase the availability of healthy food in existing small stores, use point-of-purchase promotions like shelf labels and posters to steer customers toward better options, and reduce costs through coupons, vouchers, or direct discounts on produce. Some programs provide cash incentives to store owners to stock healthier inventory, while others offer loans for physical expansion and refrigeration equipment that make carrying fresh food practical.
Community engagement makes a measurable difference. Programs that involve local residents in planning and promotion see better results in both sales of healthy food and actual dietary changes. Simply placing a new grocery store in an underserved area helps, but it doesn’t automatically transform eating habits if the surrounding environment is still saturated with cheaper, less nutritious options. The most successful approaches treat food access as one piece of a larger puzzle that includes affordability, education, transportation, and the built environment.
The USDA’s Food Access Research Atlas allows anyone to look up food access conditions by census tract, compare data across years, and examine how different distance thresholds change the picture. Community organizations and local governments use it to identify priority areas and make the case for investment. The data is downloadable and free.